Make limit_stderr_length a subcommand

.github/workflows/clippy_dev.yml

@@ -38,8 +38,8 @@ jobs:
       run: cargo build --features deny-warnings
       working-directory: clippy_dev
 
-    - name: Test limit-stderr-length
-      run: cargo dev --limit-stderr-length
+    - name: Test limit_stderr_length
+      run: cargo dev limit_stderr_length
 
     - name: Test update_lints
       run: cargo dev update_lints --check

clippy_dev/src/main.rs

@@ -95,17 +95,12 @@ fn main() {
                         .takes_value(true),
                 ),
         )
-        .arg(
-            Arg::with_name("limit-stderr-length")
-                .long("limit-stderr-length")
-                .help("Ensures that stderr files do not grow longer than a certain amount of lines."),
+        .subcommand(
+            SubCommand::with_name("limit_stderr_length")
+                .about("Ensures that stderr files do not grow longer than a certain amount of lines."),
         )
         .get_matches();
 
-    if matches.is_present("limit-stderr-length") {
-        stderr_length_check::check();
-    }
-
     match matches.subcommand() {
         ("fmt", Some(matches)) => {
             fmt::run(matches.is_present("check"), matches.is_present("verbose"));
@@ -129,6 +124,9 @@ fn main() {
                 Err(e) => eprintln!("Unable to create lint: {}", e),
             }
         },
+        ("limit_stderr_length", _) => {
+            stderr_length_check::check();
+        },
         _ => {},
     }
 }